Add syntax files from upstream vim repository

syntax/wdiff.vim

@@ -0,0 +1,33 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Vim syntax file
+" Language:     wDiff (wordwise diff)
+" Maintainer:   Gerfried Fuchs <alfie@ist.org>
+" Last Change:  25 Apr 2001
+" URL:		http://alfie.ist.org/vim/syntax/wdiff.vim
+"
+" Comments are very welcome - but please make sure that you are commenting on
+" the latest version of this file.
+" SPAM is _NOT_ welcome - be ready to be reported!
+
+
+" quit when a syntax file was already loaded
+if exists("b:current_syntax")
+  finish
+endif
+
+
+syn region wdiffOld start=+\[-+ end=+-]+
+syn region wdiffNew start="{+" end="+}"
+
+
+" Define the default highlighting.
+" Only when an item doesn't have highlighting yet
+
+hi def link wdiffOld       Special
+hi def link wdiffNew       Identifier
+
+
+let b:current_syntax = "wdiff"
+
+endif